Transient growth of acoustical energy associated with mitigating thermoacoustic oscillations

Li, Xinyan; Zhao, Dan; Yang, Xinglin; Wen, Huabing; Xiao, Jin; Shen, Li; Zhao, He; Xie, Changqing; Liu, Haili

doi:10.1016/j.apenergy.2016.01.060

Cited by 29 publications

(5 citation statements)

References 33 publications

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“…The maximum transient growth of total energy is also much smaller than that of @ ¼ 0. This finding is consistent with the transient growth of acoustical energy [52][53][54][55][56]. And this is also because the generated entropy wave is weaker for @ ¼ 1 than that for @ ¼ 0.…”

Section: Effect Of @supporting

confidence: 86%

Transient energy growth analysis of a thermoacoustic system with distributed mean heat input

Zhao

Goey

2016

International Journal of Heat and Mass Transfer

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Section: Effect Of @supporting

confidence: 86%

Transient energy growth analysis of a thermoacoustic system with distributed mean heat input

Zhao

Goey

2016

International Journal of Heat and Mass Transfer

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“…Over the years, different approaches have been studied in order to reduce and/or control thermoacoustic instability during the combustion process [28][29][30][31]. Modifying the geometry and configuration of combustion burners, for example, adjusting the fuel-supplying system, and adding acoustic damper devices, such as Helmholtz resonators, are widely used strategies in research [32][33][34].…”

Section: Resultsmentioning

confidence: 99%

Patent Analysis of the Development of Technologies Applied to the Combustion Process

et al. 2022

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The use of combustion in industrial activity is of paramount importance for economic and social development. However, combustion reactions are the main sources of atmospheric pollutant emissions. Given this reality, it is necessary to study new combustion techniques, such as the application of oxygen in the process, in order to increase the efficiency and productivity of the burning process and energy production. In addition, studies have reported the use of acoustic excitation, a low-investment technique that can promote higher rates of heat and mass transfer. Thus, the goal of this study was to bring data on the current scenario related to the application of these two technologies to the combustion process where, through the reported results, they can be used as a guide for companies’ decisions about new technologies and global trends to be identified. For this, a technological prospection was carried out which focused on patents to investigate the use of oxygen-enhanced combustion and acoustic excitation coupled to the combustion process; a total of 88 documents were found. Few documents applied acoustic excitation for process improvement, indicating that its use is recent; however, according to the literature, it is a promising field to be explored. Siemens AG was the main depositor, and ten primary inventors were identified. Germany and the United States were the countries with the highest number of filings. In the prospected documents, it was possible to identify that there is a need for the further investigation of the joint use of both techniques. These investigations may lead to the development of processes and devices that can provide economic and environmental gains for the energy industry.

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“…Equivalence ratio Ф is a critical parameter indicating combustion conditions such as rich or lean combustion. Ф denotes the fuel air ratio, which affect the combustion efficiency and thermoacoustic stability [40,41]. When stoichiometric combustion (also known as complete combustion) occurs, ϕ = 1.0.…”

Section: Description Of Experimentsmentioning

confidence: 99%

Experimental study of equivalence ratio and fuel flow rate effects on nonlinear thermoacoustic instability in a swirl combustor

Zhao

et al. 2017

Applied Energy

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Industrial combustion systems such as power generation gas turbines, rocket motors, furnaces and boilers often face the problem of large-amplitude self-excited pressure oscillations that occur due to the onset of thermoacoustic instability. To prevent the onset of such instability, understanding the effects of fuel-air equivalence ratio ϕ, fuel flow rate V f on self-excited nonlinear thermoacoustic oscillations is of fundamental and practical importance. Experimental investigation of the roles of these parameters on triggering thermoacoustic instability in a swirl combustor has received very little attention. In this work, we design a swirling thermocoustic combustor and conduct a series of experimental tests. Autocorrelation and recurrence analysis of phase space trajectories reconstructed from the acoustic pressure time trace are performed. These experimental tests allow us to study the effect of fuel-air equivalence ratio ϕ on the onset of thermoacoustic instability by varying the fuel volume flow rate V f . We demonstrate that the fuel volume flow rate and the equivalence ratio play different but critical roles on generating thermoacoustic instability at different frequencies and amplitudes. Maximum sound pressure level can be as high as 135 dB. In addition, mode switching, (i.e. frequency swap) is found to occur between approximately ω 3 ≈ 510 Hz and ω 1 ≈ 170 Hz, depending on the equivalence ratio ϕ. Furthermore, the dominant frequency corresponding to the maximum amplitude is shown to be shifted by approximately 20%, as the fuel flow rate V f is increased and the combustion condition is changed from lean to rich. These findings are quite useful for designing a feedback control strategy to stabilize an unstable combustor. The present work opens up an applicable means to design a stable swirling combustor.

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Transient growth of acoustical energy associated with mitigating thermoacoustic oscillations

Cited by 29 publications

References 33 publications

Transient energy growth analysis of a thermoacoustic system with distributed mean heat input

Transient energy growth analysis of a thermoacoustic system with distributed mean heat input

Patent Analysis of the Development of Technologies Applied to the Combustion Process

Experimental study of equivalence ratio and fuel flow rate effects on nonlinear thermoacoustic instability in a swirl combustor

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